2006-09-18 12:03:48 · 4 answers · asked by mndbshp 1 in Science & Mathematics ➔ Biology
DNA replication happens by the double helix unzipping and 'new' complementary bases attaching to both strands, thereby ending up with two identical DNA double helices. The whole chromosome will be replicated, however only a 'genes worth' of RNA would be made.
Manufacture of an RNA molecule happens by unzipping a section of the DNA molecule, and complementary RNA base pairing with the exposed DNA bases. (U replaces T in RNA though). Therefore the RNA (I'm assuming mRNA) molecule produced is a single stranded short section, not identical to the DNA section it was made from, but complementary to it.
The idea is that the resulting tRNA sequence will be identical (again with U's instead of T's though) to the original DNA sequence copied.
2006-09-22 11:05:59 · answer #1 · answered by Kate W 2 · 0⤊ 0⤋
There are different forms of RNA, which have different structures: tRNA looks almost like a cross and is used to bring amino acids together in a sequence determined by the mRNA strand. There is also rRNA which forms ribosomes. All of this RNA is single stranded, and uses one strand of DNA as a template. However, it does not use the entire strand of DNA as a template, but a rather small region. If you are talking about eukaryotes and prokaryotes, RNA is used in the transcription and translation processes, or for making ribosomes. DNA is used for replication or as the template for the other procedures mentioned.
Totally weird stuff happens in viral genetics though. DNA or RNA can be either single stranded or double stranded, and a virus can have either as its basic genetic system. In retroviruses. A DNA copy is made from an RNA template to be inserted into the host's DNA. Very crazy stuff and so interesting.
2006-09-18 12:20:42 · answer #2 · answered by Zelda Hunter 7 · 0⤊ 0⤋
DNA replication occurs when a cell divides and the nuclei "shares" the DNA info to the daughter cells.
Manufacture of RNA molecule or messenger RNA (mRNA) serves as a templete form DNA to transfer amino acids to the ribosomes to form proteins, translate genes into proteins.
2006-09-18 12:10:35 · answer #3 · answered by dunce002917 2 · 0⤊ 0⤋
DNA has thymine and RNA has Uracil. DNA is also a double helix and mRNA is a single strand of nucleotides.
2006-09-18 12:06:14 · answer #4 · answered by college kid 6 · 0⤊ 0⤋